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yumdownloader 无法解决依赖关系？

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yumdownloader 无法解决依赖关系？

根据yum下载器：

   --resolve
          When downloading RPMs, resolve dependencies and also download the required packages.

然而，当我尝试时：

$ sudo yumdownloader devtoolset-7-gcc-c++.x86_64 --destdir /opt/downloaded_rpms/ --resolve

它没有下载依赖项：

$ ll /opt/downloaded_rpms/
total 11644
-rw-r--r-- 1 root root 11683460 Dec 25 17:10 devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64.rpm

因此，当我尝试安装时，它抱怨道：

# sudo yum install /tmp/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64.rpm 
Loaded plugins: fastestmirror
Examining /tmp/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64.rpm: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64
Marking /tmp/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package devtoolset-7-gcc-c++.x86_64 0:7.2.1-1.el7.sc1 will be installed
--> Processing Dependency: devtoolset-7-gcc = 7.2.1-1.el7.sc1 for package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64
...
...
--> Processing Dependency: devtoolset-7-libstdc++-devel = 7.2.1-1.el7.sc1 for package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64
--> Processing Dependency: devtoolset-7-runtime for package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64
--> Finished Dependency Resolution
Error: Package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64 (/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64)
           Requires: devtoolset-7-gcc = 7.2.1-1.el7.sc1
Error: Package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64 (/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64)
           Requires: devtoolset-7-libstdc++-devel = 7.2.1-1.el7.sc1
Error: Package: devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64 (/devtoolset-7-gcc-c++-7.2.1-1.el7.sc1.x86_64)
           Requires: devtoolset-7-runtime
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

我做错什么了吗？

谢谢！

答案1

根据 Red Hat错误 1152326：

...这是依赖项已安装时的预期行为。yumdownloader --resolve将仅下载缺少的依赖项。您可以使用空的installroot来下载包及其所有依赖项：

# yumdownloader NAME --resolve --installroot=/path/to/installroot --releasever=/

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